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ATPL230A Datasheet(PDF) 26 Page - ATMEL Corporation |
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ATPL230A Datasheet(HTML) 26 Page - ATMEL Corporation |
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26 / 122 page  ATPL230A [DATASHEET] Atmel-43053J-ATPL230A-Datasheet_22-Sep-16 26 On the other hand, to decrypt a data package with corresponding KEY, the process is as follows: 1. Write the KEY (128 bits long) in AES_KEY register. This step is only needed if a new key is going to be used (due to a key change or to a reset operation). 2. Write the 128 bits of encrypted data in AES_DATA register. 3. Set to ‘0’ the CIPHER control bit in AES_CTL register and then set to ‘1’ the START control bit to start the operation. This step could be realized as an atomic operation writing 0x02. 4. Wait until the READY bit in AES_CTL register becomes ‘1’ automatically. This bit indicates when the operation is completed. 5. After that, the decrypted (decoded) data package is automatically stored in AES_DATA register. |
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